Explain the process of formation of petroleum.
Petroleum was formed from the dead and decay organisms that got buried deep in the sea, millions of years ago. These dead and decay bodies got covered by layer of sand and clay. Lack of air, high temperature and high pressure, transformed these dead organisms into petroleum natural gas.
Popular Questions of Class 8 Science
- Q:-
Describe with the help of a diagram an instrument which can be used to detect a charged body.
- Q:-
Sketch larynx and explain its function in your own words.
- Q:-
Arrange the following boxes in proper order to make a flow chart of sugarcane crop production.
- Q:-
Make a labelled diagram of a candle flame.
- Q:-
What is metamorphosis? Give examples.
- Q:-
The following Table shows the total power shortage in India from 1991– 1997. Show the data in the form of a graph. Plot shortage percentage for the years on the Y-axis and the year on the X-axis.
- Q:-
Make sketches of animal and plant cells. State three differences between them.
- Q:-
What is a constellation? Name any two constellations.
- Q:-
Describe the construction of a kaleidoscope.
- Q:-
Complete the crossword with the help of clues given below:
Across
1. This is necessary for photosynthesis.
3. Term for component present in the cytoplasm.
6. The living substance in the cell.
8. Units of inheritance present on the chromosomes.Down
1. Green plastids.
2. Formed by collection of tissues.
4. It separates the contents of the cell from the surrounding medium.
5. Empty structure in the cytoplasm.
7. A group of cells.
Recently Viewed Questions of Class 8 Science
- Q:-
What is irrigation? Describe two methods of irrigation which conserve water.
- Q:-
If wheat is sown in the kharif season, what would happen? Discuss.
- Q:-
Why should paper be saved? Prepare a list of ways by which you can save paper.
- Q:-
Describe the threat to the beauty of the Taj Mahal.
- Q:-
Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose water will get heated in a shorter time?
- Q:-
Mark (✓) the correct answer:
Rayon is different from synthetic fibres because
(a) it has a silk like appearance
(b) it is obtained from wood pulp
(c) its fibres can also be woven like those of natural fibres - Q:-
Tick True/False against the following statements :
(a) Fossil fuels can be made in the laboratory. (T/F)
(b) CNG is more polluting fuel than petrol. (T/F)
(c) Coke is almost pure form of carbon. (T/F)
(d) Coal tar is a mixture of various substances. (T/F)
(e) Kerosene is not a fossil fuel. (T/F) - Q:-
Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room. Explain.
- Q:-
The weather department has predicted that a thunderstorm is likely to occur on a certain day. Suppose you have to go out on that day. Would you carry an umbrella? Explain.
- Q:-
Make sketches of animal and plant cells. State three differences between them.
- NCERT Chapter